Final answer:
The subject of this question is Psychology, specifically the cognitive development of infants in the sensorimotor stage.
Step-by-step explanation:
The subject of this question is Psychology, specifically the cognitive development of infants in the sensorimotor stage. During this stage, children learn about the world through their senses and motor behavior. They can understand only what they see, hear, or touch. This stage lasts from birth to about 2 years old.